Electronic
control relay for detecting a rising water
level. Inside a waterproof enclosure they have a
medium-power relay, which are operated by water
reaching the trip level, and can be used to
control alarms or other equipment. The relay is
normally energized when the power supply is
switched on and no water is present. When water
rises up the side of the box to reach the
switching level, the relay drops out. This
sequence is failsafe, allowing each model to be
used as a water spillage alarm switch or to turn
off a valve or stop an air conditioning unit
before the water overflows its containment.
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